This worked for me brilliantly with baby 2: tell yourself that your due date is just a guide, and you're not actually overdue. The baby will come when ready.
Also, refuse to tell anyone your actual guideline due date, or how many days past it you've gone. Just say you're due in mid January, and leave it at that. If you give people dates they start making comments about how late you are, etc, which will leave you feeling pressurised and uneasy about something which is very normal and actually good for your baby.
Both of mine came at 13 days past the guide date, and that was with a gentle bit of encouragement - ie a sweep with one and castor oil with the other.
Finally, if you want to check whether your cervix is 'ripe', ie ready for the baby to come at any time, you should wash your hands thoroughly then stick a finger in your vagina and feel it. If the cervix is low and mushy, it's ripe. It should feel more like a chin than a nose.
Is any of this useful?
Wrt labour, it's a bit late to start listening to a hypno cd now but if you practice relaxing and breathing slowly, counting down from 3 to relax, this is a good habit to help you manage labour pains. Relaxing is ESSENTIAL. Tell yourself as many positive things about labour as you can, read up on positive labour stories, and AVOID One Born Every Minute like the plague - it will kill your confidence as you prepare to give birth. Your body is amazing and is about to do something extraordinary. What a huge privilege.
Good luck, and congrats in advance! 